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Share-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Feb. 29, 2012
Incentive award
Jun. 30, 2012
Stock Options
Jun. 30, 2011
Stock Options
Jun. 30, 2012
Restricted Stock
Share-Based Compensation                
Total compensation expense recognized for share-based compensation (in dollars) $ 120,000 $ 171,000 $ 267,000 $ 330,000        
Historical annual forfeiture rates (as a percent) 3.30% 3.80% 3.30% 3.80%        
Share-Based Compensation                
Incentive bonus on meeting certain performance metrics (in dollars)         150,300      
Common stock issued (in shares)         39,294      
Summary of stock option award activity                
Outstanding at the beginning of the period (in shares)           86,500    
Forfeited or cancelled (in shares)           (7,500)    
Outstanding at the end of the period (in shares)           79,000    
Exercisable at the end of the period (in shares)           67,000    
Expected to vest at the end of the period (in shares)           8,600    
Weighted Average Exercise Price                
Outstanding at the beginning of the period (in dollars per share)           $ 24.08    
Forfeited or cancelled (in dollars per share)           $ 29.94    
Outstanding at the end of the period (in dollars per share)           $ 23.52    
Exercisable at the end of the period (in dollars per share)           $ 26.13    
Expected to vest at the end of the period (in dollars per share)           $ 8.93    
Weighted Average Grant-Date Fair Value                
Forfeited or cancelled (in dollars per share)           $ 12.02    
Outstanding at the end of the period (in dollars per share)           $ 8.53    
Exercisable at the end of the period (in dollars per share)           $ 9.35    
Expected to vest at the end of the period (in dollars per share)           $ 3.94    
Weighted Average Remaining Contractual Term                
Outstanding at the end of the period           3 years 9 months 18 days    
Exercisable at the end of the period           3 years 3 months 18 days    
Expected to vest at the end of the period           6 years 6 months    
Additional disclosure                
Fair value of shares vested (in dollars)           79,000 76,000  
Total unamortized compensation expense (in dollars)           $ 28,000    
Weighted average period for recognition of unamortized compensation expense           1 year 1 month 6 days    
Summary of restricted stock activity                
Nonvested balance at the beginning of the period (in shares)               218,929
Granted (in shares)               15,000
Vested (in shares)               (40,384)
Forfeited or cancelled (in shares)               (50,400)
Nonvested balance at the end of the period (in shares)               143,145
Weighted Average Grant-Date Fair Value                
Nonvested balance at the beginning of the period (in dollars per share)               $ 8.92
Granted (in dollars per share)               $ 4.00
Vested (in dollars per share)               $ 4.50
Forfeited or cancelled (in dollars per share)               $ 5.09
Nonvested balance at the end of the period (in dollars per share)               $ 7.83